package day02;
public class DataTypeCastDemo {
    public static void main(String[] args) {
        //两种方式
        /*
        int a = 5;
        long b = a;//自动类型转换
        int c = (int)b;//强制类型转换

        long d = 5;//自动类型转换
        double e = 5;//自动类型转换
        System.out.println(e);//5.0，默认保留一位小数

        long f = 10000000000L;
        int g = (int)f;
        System.out.println(g);//1410065408，强转有可能发生溢出
        double h = 25.987;
        int i = (int)h;
        System.out.println(i);//25，强转有可能丢失精度
        */

        //两点规则
        byte b1 = 5;//5为整数直接量
        byte b2 = 6;
        byte b3 = (byte) (b1+b2);

        System.out.println(2+2);//4
        System.out.println(2+'2');//52
        System.out.println('2'+'2');//100

        int m = 'a';
        System.out.println(m);//97，查看字符对应的码
        char n = 97;
        System.out.println(n);//a，查看码对应的字符
    }
}
